The most terrifying dinosaur ever discovered comes to DVD 3/12 from the BBC in the fight for the title of ultimate predator of the Jurassic period, there are a number of contenders. However, all could be eclipsed by a startling discovery deep in the Polar Arctic: Predator X. Deep in the permafrost at the top of the world, the fossil of a giant sea-monster has been uncovered. Weighing five times as much as Tyrannosaurus Rex, it's body was more than 50 feet long. Four huge flippers enabled it to accelerate quickly through the waves, while it's bite power - estimated at over 33,000 pounds (four times the strength of T-Rex) - made it the most formidable predator in the Jurassic oceans.